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Device and method for carrying out liquid-phase pre-lithiation treatment on silicon monoxide negative electrode material

A negative electrode material, silicon oxide technology, applied in battery electrodes, electrochemical generators, structural parts, etc., can solve the problems of reduced lithium reducibility and potential safety hazards, and achieve reduced production costs, low processing temperature, and good economic benefits. Effect

Pending Publication Date: 2022-07-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a device and method for liquid-phase pre-lithiation treatment of silicon oxide negative electrode materials, so as to solve the problem of reducing lithium reducibility in the process of using liquid phase method to pre-treat silicon oxide materials in the prior art problems and potential safety hazards caused by the volatilization of organic solvents; at the same time, the device can provide a good oxygen-free and water-free environment to ensure the smooth progress of pre-lithiation treatment

Method used

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  • Device and method for carrying out liquid-phase pre-lithiation treatment on silicon monoxide negative electrode material
  • Device and method for carrying out liquid-phase pre-lithiation treatment on silicon monoxide negative electrode material

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Embodiment 1

[0032]Get 2kg SiO (D50=6um) and add in mixing kettle 2, open the first stirring paddle 8, open the second heating device 7 to heat, keep the temperature at 190 ° C, and store in vacuum, the first locking valve 10 and the second locking Valve 11 remains closed. Add diphenyl ether and 105g of lithium ingot to the solvent kettle 1, quickly vacuumize, turn on the first heating device 6 to heat, and turn on the second stirring paddle 9 to stir, heat to 190 ° C, keep the temperature for 3 hours, and open the first locking valve. 10. Lithium in molten state is dispersed in diphenyl ether, and then through the first pipeline 4, under the action of the nozzle 12, the diphenyl ether dispersed with lithium is evenly touched and sprinkled on the SiO precursor in the mixing kettle 2, and the solvent is After the material in the kettle 1 is touched and sprinkled, the first locking valve 10 is closed. After the first stirring paddle stirring paddle 8 is continuously stirred at 190 ° C for 3...

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Abstract

The invention discloses a device and a method for carrying out liquid-phase pre-lithiation treatment on a silicon monoxide negative electrode material. The device comprises a solvent kettle for dissolving a lithium source in an organic solvent, a mixing kettle for mixing the silicon monoxide negative electrode material and the lithium source, and a solvent recovery kettle for recovering the organic solvent, the device is used for carrying out liquid-phase pre-lithiation treatment on the silicon monoxide negative electrode material, so that the problem of potential safety hazards caused by volatilization of an organic solvent in the pretreatment process of a liquid-phase method can be effectively solved, the organic solvent can be recycled, the production cost can be remarkably reduced, and the device has good economic benefits and industrial application prospects. Besides, the selected organic solvent is a high-boiling-point inert solvent which does not react with the lithium metal, so that the lithium metal keeps zero valence and has strong reducibility, and the high-boiling-point inert solvent only plays a role in heat conduction and lithium metal dispersion, so that the lithium metal is molten and dispersed into fine particles in the solvent and can fully react with the silicon monoxide negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a device and a method for performing liquid-phase pre-lithiation treatment on a silicon oxide negative electrode material. Background technique [0002] Traditional graphite anodes can no longer meet the needs of higher energy density in cell design. Si oxide anodes have high specific capacity and are considered to be the most promising new-generation anode materials, but they also have some defects and cannot be applied on a large scale. . When lithium is inserted into the silicon oxide negative electrode, the expansion reaches 200%, and the material is easily pulverized and fails during the cycle. When lithium is inserted for the first time, a large amount of irreversible lithium silicate is formed, resulting in a low first effect and poor conductivity of the material itself. [0003] In order to improve the first Coulomb efficiency, it can be pre-lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525
CPCH01M10/0525H01M4/48
Inventor 丁男万文文赵宇飞王辉林少雄
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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